42599993 has 2 divisors, whose sum is σ = 42599994. Its totient is φ = 42599992.

The previous prime is 42599989. The next prime is 42600023. The reversal of 42599993 is 39999524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33790969 + 8809024 = 5813^2 + 2968^2 .

It is a cyclic number.

It is not a de Polignac number, because 42599993 - 2² = 42599989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42599903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21299996 + 21299997.

It is an arithmetic number, because the mean of its divisors is an integer number (21299997).

Almost surely, 2^42599993 is an apocalyptic number.

It is an amenable number.

42599993 is a deficient number, since it is larger than the sum of its proper divisors (1).

42599993 is an equidigital number, since it uses as much as digits as its factorization.

42599993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 787320, while the sum is 50.

The square root of 42599993 is about 6526.8670125873. The cubic root of 42599993 is about 349.2500759629.

The spelling of 42599993 in words is "forty-two million, five hundred ninety-nine thousand, nine hundred ninety-three".